Parker pencils, specifically models like the Parker 45, 51, 61, and 75 rotary pencils, typically use 0.9mm lead.
While 0.9mm was a common standard, it's important to note a few variations and modern trends:
- Older Models: Many vintage Parker pencils, including the mentioned models, were designed for 0.9mm lead.
- Clutch Pencils: Some older clutch pencils may have used a thicker 1.18mm lead.
- Modern Pencils: Since the 1980s, it's become increasingly common to find mechanical pencils using thinner leads, such as 0.5mm and 0.7mm. However, this doesn't generally apply to vintage Parker pencils.
Therefore, for a classic Parker pencil, especially the rotary models, 0.9mm lead is the correct size to use. If you have a more modern Parker mechanical pencil, it's always best to check the pencil itself for markings indicating the lead size or refer to the product documentation.
